Coated metal pipe and method of manufacturing the same



(No Model.)

W. LACY, Jr. COATED METAL PIPE AND METHOD 0E MANUFACTURING TEE SAME. No. 475,454.

Patented May 24, 1892.

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UNITED STATES PATENT OFFICE.

WILLIAM LACY, JR., OF LOS ANGELES, CALIFORNIA.

COATED METAL PIPE AND METHOD 0F MANUFACTURING THE SAME.

SPECIFICATION forming part of Letters Patent No. 475,454, dated May 24, 1892.

Application filed January Z2, 1892. Serial No. 418,879. (No model.)

To a/ZZ whom t may concern:

Be it known that I, WILLIAM LACY, Jr., a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Improvement in Coated Metal Pipes and Method of Manufacturing the Same, of which the following is a specification.

My invention relates most particularly to underground pipes formed of sheet metal.

My invention comprises a sheet-Inetal pipe provided with a coating of preservative gum and fibrous material.

It also comprises the combination of a sheet-metal pipe, an inner coating of preservative gum, an intermediate coat-ing of fibrous material, and an exterior coating of preservative gum.

It also comprises the method of manufacturing said coated pipe.

It has been customary to coat sheet-metal pipes With asphalt or other preservative gums to protect. the metal from the action of the Great difficulty has been experieneed in safely handling pipes of this character, in that the preservative coating of asphalt or similar material is liable to be removed in places, thus exposing the metal to the action of the elements.

The object of my invention is to produce a coated sheet-metal pipe which will be free from this object-ion. My new article of manufacture consists of a sheet-metal pipe coated with asphalt and crude petroleum or other preservative gum and provided with an intermediate coating of sawdust or other suitable disintegrated 'brous material and an exterior coating of asphalt and crude petroleum or other preservative gum applied hot.

My improved method of manufacture is as follows: The sheet-metal pipe is dipped i-n the bath of hot asphalt and petroleum or similar preservative gum, and after being removed from the bath the coated pipe is rolled in sawdust or some similar disintegrated fibrous material while the asphalt-coatin g is still hot and viscid. The pipe and its coating are then allowed to cool, after which it is again dipped in a bath of hot asphaltum and crude petroleum of proper consistency to form a tough coating when cool. The sawdust adheres to the asphalt coating and forms a jacket to which the second coating of asphaltum adheres, thereby forming a thick and tough coating which thoroughly protects the metal from corrosion and is not liable to be knocked off in handling. In practice I am enabled by this means to form a coating from one-eighth to one-quarter of an inch thick.

In the accompanying drawings, Figure lis a perspective view of a section of my irnproved pipe in its second stage of manufacture. Fig. 2 is an enlarged cross-section of a fragment of the pipe when completed.

A represents a sheet-metal pipe.

b represents the coating of gum or asphaltum on the inside of the pipe.

d represents the inner coating of gum or asphaltum on the outsideof the metal.

e represents the intermediate coating.

f represents the exterior coating or jacket of asphaltumor other suitable preservative gum.

Now, having described my invention, WhatI claim as new, and desire to secure by Letters Patent, is-

l. The combination set forth of the sheetmetal pipe, the inner coating of preservative gum, the intermediate coating ot' fibrous material, and the exterior coating of preservative gum, substantially as and for the purpose set forth.

2. The method set forth of manufacturing coated metal pipes, consisting in first dipping sheet-metal pipes in a bath of hot preservative gum; second, rolling the coated pipe in suitable disintegrated fibrous material While the coating of gum is hot and viscid; third, cooling the pipe and its coating, and, fourth, dipping the pipe thus coated in a bath of hot preservative gum.

WM. LACY, JR.

Witnesses:

JAMES R. ToWNsEND, ALFRED I. TowNsEND. 

